Find Work

  • #1
37
2

Homework Statement


A child 1.52 meters tall pulled a 2.54 kg toy car for 10 meters. The car has a string attached to it, and when pulled creates a 25 degree angle from the horizon. If the string has a force of 123 N on it while being pulled, how much work did the child do?

Homework Equations


work = force x displacement

The Attempt at a Solution


W = (123 N)(10 m) cos(25 degrees) = 1114.8 J

is this correct? does the child's height have anything to do with the problem?
 

Answers and Replies

  • #2
Doc Al
Mentor
45,378
1,757
W = (123 N)(10 m) cos(25 degrees) = 1114.8 J

is this correct?
Yep! Good!

does the child's height have anything to do with the problem?
Nope. (Neither does the car's mass.)
 
  • #3
182
19
Seems okay to me and no, the child's height is irrelevant.
 

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